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200 cm3 of air was passed over heated copper in a syringe several times to...

Chemistry
JAMB 1997
200 cm3 of air was passed over heated copper in a syringe several times to produce copper (II) oxide.
When cooled, the final volume of air recorded was 158cm3. Estimate the percentage of oxygen in the air?
  • A. 31%
  • B. 27%
  • C. 21%
  • D. 19%
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Correct Answer: Option C
Explanation
Volume of O2 used = 200 - 158 = 42 cm3
% of O2 = (42)/(200) x 100% = 21%
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